21020013210133 has 4 divisors (see below), whose sum is σ = 24022872240160. Its totient is φ = 18017154180108.

The previous prime is 21020013210127. The next prime is 21020013210137. The reversal of 21020013210133 is 33101231002012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21020013210133 - 2²¹ = 21020011112981 is a prime.

It is a super-2 number, since 2×21020013210133² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21020013210133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020013210137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1501429515003 + ... + 1501429515016.

It is an arithmetic number, because the mean of its divisors is an integer number (6005718060040).

Almost surely, 2^{21020013210133} is an apocalyptic number.

It is an amenable number.

21020013210133 is a deficient number, since it is larger than the sum of its proper divisors (3002859030027).

21020013210133 is an equidigital number, since it uses as much as digits as its factorization.

21020013210133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3002859030026.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21020013210133 its reverse (33101231002012), we get a palindrome (54121244212145).

The spelling of 21020013210133 in words is "twenty-one trillion, twenty billion, thirteen million, two hundred ten thousand, one hundred thirty-three".